* {
    margin: 0px;
    padding: 0px;
}

.xianshi {
    border: 1px solid black;
    width: 800px;
    height: 300px;
    margin: 0 auto;
}

#shuru {
    width: 800px;
    margin: 20px auto;
    height: 100px;
    border: 1px solid black;
    display: block;
}

.big {
    width: 806px;
    height: 500px;
    margin: 0 auto;
}

.p1 {
    text-align: right;
}

.zishu {
    color: red;
}

b {
    display: block;
    float: left;
}

i {
    display: block;
    float: right;
}

